Observation 104534: Amanita bisporigera G.F. Atk.
When: 2012-08-09
Herbarium specimen reported
0 Sequences

Fruiting under Oak (some Maple also present nearby). Initially I thought Amanita virosa, but spores are too small and caps are not pure white. Initially a pleasant strong sweet smell, but becoming overpowering after a while. 5% KOH on cap gives yellow reaction and I can only find 2-spored basidia. See attached photomicrographs.

Spores globose to subglobose, amyloid in Melzer’s and (7.1-8.5) x (5.3-7.4) microns with an average Q of 1.15

Proposed Names

-14% (2)
Used references
Based on microscopic features
81% (1)
Recognized by sight: volval limb on bulb NOT upstanding and NOT somewhat distant from stem
Based on microscopic features: 2-spored basidia dominating in early mushroom season
Based on chemical features: yellow cap reaction

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Thanks Rod!
By: Linas Kudzma (baravykas)
2012-08-10 15:00:15 CDT (-0500)

Created: 2012-08-09 13:59:49 CDT (-0500)
Last modified: 2012-08-09 19:22:23 CDT (-0500)
Viewed: 159 times, last viewed: 2017-10-09 18:10:18 CDT (-0500)
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